I would take a chance on the aftermarket damper. It doesn't seem like these fail that often so it's likely you'll never need to replace it again. You could also look for a used part? Cheaper, and more risky.

What did the indie say?

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2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD---
1993 318i - Brilliantrot / Tan - bone stock daily driver